Metrology And Measurements Set 2

Mechanical Engineering

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This set of Metrology and Measurements Multiple Choice Questions & Answers (MCQs) focuses on Metrology And Measurements Set 2

Q1 | Most accurate method of direct measuring is with                  
  • passometer
  • pedometer
  • theodolite
  • chaining
Answer: chaining
Explaination:
theodolite measurement is not under direct measurements. measurement with passometer, measurement with pedometer, pacing is based on the method of measuring the distances directly.
Q2 | Which of the following is not under direct measurement?
  • pacing
  • chaining
  • taping
  • triangulation
Answer: triangulation
Explaination:
triangulation is by optical means. pacing is rough surveying. chaining gives almost accurate readings. taping gives accurate readings.
Q3 | ground?
  • spirit level
  • plumb bob
  • butt rod
  • pegs
Answer: plumb bob
Explaination:
it also transfers points from line ranger to the ground. spirit level is the instrument used to level the plane table by adjusting the spirit bubble in it to center.
Q4 | What is used for measuring offsets, but it is often used by building surveyors or architects?
  • plum bob
  • butt rod
  • pegs
  • laths
Answer: butt rod
Explaination:
it generally consists of two laths, each of 1 yard or 1 m in length loosely tiered together. plumb bob is suspended at the center of the plane table to transfer the points on the plan to ground.
Q5 | What is used in centering aid in theodolites, compass, plane table and variety of other surveying instruments?
  • butt rod
  • whites
  • laths
  • plumb bob
Answer: plumb bob
Explaination:
plumb bob transfers points to the ground so it is used for centering. butt are used for measuring offsets.
Q6 | Which of the following option is incorrect about interchangeability?
  • increase output
  • increase cost of production
  • useful in mass production
  • assembly time increases
Answer: assembly time increases
Explaination:
an interchangeable part is one that can be replaced with a similar part manufactured to the same drawing. it can be used in mass production with an economic oriented approach. assembly time decreases as mating parts are interchangeable.
Q7 | What are the main considerations for deciding the limits of a particular part?
  • functional requirement
  • economics and interchangeability
  • interchangeability and functional requirement
  • interchangeability, functional requirement and economics
Answer: interchangeability, functional requirement and economics
Explaination:
functional requirements are related to the function of a component that is what is required to do. interchangeability is for ease of replacement of part. economics is related to the minimum cost and time.
Q8 | For full interchangeability, what is the relation between the process capability of a machine and manufacturing tolerance of the part?
  • process capability = manufacturing tolerance
  • process capability ≥ manufacturing tolerance
  • process capability > manufacturing tolerance
  • process capability ≤ manufacturing tolerance
Answer: process capability ≤ manufacturing tolerance
Explaination:
for full interchangeability, only such machines are selected for manufacturing whose process capability ≤ manufacturing
Q9 | Which of the following option is correct in given statements about interchangeability? Statement 1: Standardisation is not so much of importance for interchangeability. Statement 2: Interchangeability follows ‘normal distribution’.
  • f, t
  • t, t
  • f, f
  • t, f
Answer: f, t
Explaination:
standardisation is important in interchangeability. it is essential to follow a common standard by all, only then interchangeability is possible. all standards used by the manufacturing unit are traceable to international standards.
Q10 | Which of the following option is not correct for ‘full interchangeability’?
  • this type of interchangeability is not feasible sometimes
  • requires machine which can maintain low process capability
  • machines with very high accuracy are necessary
  • for interchangeable production, this type of interchangeability is not must
Answer: requires machine which can maintain low process capability
Explaination:
full interchangeability is also known as universal interchangeability. many times, universal interchangeability is not feasible because it requires machine capable of maintaining very high accuracy and high process capability.
Q11 | What is the correct formula to find no. of groups in selective assembly?
  • process capability / tolerance desired
  • tolerance desired / process capability
  • tolerance desired * process capability
  • tolerance desired + process capability
Answer: process capability / tolerance desired
Explaination:
no. of groups segregated in selective assembly depends upon desired tolerance and process capability of machine. conditions like high quality and low cost can be achieved by selective assembly technique.
Q12 | What is a limit system?
  • series of tolerances
  • series of fits
  • series of clearances
  • series of limits
Answer: series of tolerances
Explaination:
limit system is a series of tolerances arranged to suit a specific range of size. by this, limits of size are selected and given to mating parts to ensure specific classes of fit.
Q13 | Which of the following is correct for selective assembly?
  • not suitable for industrial purposes
  • cost increases due to automatic gauging
  • wastage is high due to selective selection
  • this method is followed in ball and roller bearing units
Answer: this method is followed in ball and roller bearing units
Explaination:
selective assembly technique is
Q14 | Which of the following is used to check change in ocular lines position due to column rotation in universal micrometer?
  • dial indicator
  • slip gauges
  • control shaft
  • universal microscope
Answer: control shaft
Explaination:
a special control shaft is used to check this where a right angled blade is provided at right angle to shaft diameter line. the ocular line is made to coincide with the blade and the column is titled, the shift in position of the ocular line is noted, this shift is the required error.
Q15 | What is the least count of clinometer which is used to check reading of column rotation used for setting of helix angles in universal micrometer?
  • 1’
  • 2’
  • 3’
  • 4’
Answer: 1’
Explaination:
the permissible error which is allowed in the entire range of column rotation is ± 5′. a clinometer is used to check this which is of 1′ least count. the clinometer is put over column top. given inclination is further checked with clinometer.
Q16 | How 34’ can be built by using angle gauges?
  • 27’+9’-3’+1’
  • 26’+10’-2’
  • 27’+10’-3’
  • 27’+8’
Answer: 27’+9’-3’+1’
Explaination:
combinations can be made by only three series of angle gauges. minutes series is with 1’, 3’, 9’, 27’ angle gauges.
Q17 | In how many series the gauges can be divided?
  • 1
  • 2
  • 3
  • 4
Answer: 3
Explaination:
16 or 13 gauges can be divided into 3 series i.e. degree, minutes and seconds (fraction of minute).
Q18 | What is the approximate size of angle gauges?
  • 76mm long and 16 wide
  • 85mm long and 26 wide
  • 16mm long and 75 wide
  • 70mm long and 18 wide
Answer: 76mm long and 16 wide
Explaination:
angle gauges are about 3 inch (76.2 mm) long and 5/8 inch (15.87 mm) wide. and their faces are lapped within 0.0002 mm.
Q19 | What is the accuracy of master angle gauges?
  • 0.1 sec
  • 1 sec
  • 0.25 sec
  • 3 sec
Answer: 0.25 sec
Explaination:
master angle gauges are laboratory standard and most expensive of all. they measure the angle with an accuracy of
Q20 | Which gauges are present in the first series (degree) of angle gauges?
  • 5°, 10°, 15°, 25° and 40°
  • 1°, 3°, 9°, 27° and 41°
  • 1°, 5°, 9°, 25° and 45°
  • 5°, 10°, 15°, 30° and 45°
Answer: 1°, 3°, 9°, 27° and 41°
Explaination:
the standard angles gauges have 5 gauges present in the first series. they consist of 1°, 3°, 9°, 27° and 41° gauges.
Q21 | How many sets of angle gauges are available?
  • 1
  • 2
  • 3
  • 4
Answer: 2
Explaination:
two sets of angle gauges are available. one set with 16 gauges with an accuracy of 1’’ and one set with 13 gauges with 3’’.
Q22 | Statement 2: Interferometry can be used to calibrate angle gauges.
  • t, f
  • f, f
  • f, t
  • t, t
Answer: f, t
Explaination:
direct combination of angle gauges can be made up to angle 81o40.9’. for the larger angle, square block is used with angle gauges.
Q23 | What are the two grades of angle gauges?
  • master and tool room
  • precise and normal
  • standard and industrial
  • high and low
Answer: master and tool room
Explaination:
master grade is laboratory standard and made from steel carbide or tungsten carbide. tool grade is normal industrial purpose angle gauges made from steel.
Q24 | How angle greater than 90° is measured?
  • by repeating gauges
  • using square plate
  • using sine bar
  • using auto collimator
Answer: using square plate
Explaination:
versatility of angle gauges increases when used with a square plate. square plates with angle gauge can measure angle greater than 90o.
Q25 | Which of the following is not a gauge from standard B angle gauges?
  • 0.05’
  • 1’ c) 27’
  • d) 30
Answer: 0.05’
Explaination:
standard a has 13 gauges and standard b has all gauges from standard a except 0.05’ i.e. 12 gauges.
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